Popular Science posts a neat tutorial on how to build a rotating digital photo frame that cycles through pictures posted to your Flickr account.

My mom loves seeing my digital photos, whether they're of far-off places or my latest culinary creations, so I've long thought about building her a digital-photo frame that would show a new shot every time she walked by. But instead of loading 1,000 images onto a hard drive, I wanted to be able to update the library remotely, adding new pics as I shot them, so she could always see what I'd whipped up that night or where I'd traveled that weekend. I also wanted the whole project to be cheap, because, well, I'm cheap.

Using an old Wifi-enabled laptop, a custom-size frame and Slickr, a free Flickr screensaver software set to use photos you tag "formom," it can be done for about $200. Fantastic gift idea for Mother's Day! Thanks, Ryan!